Repositório Digital

A- A A+

Determination of net sediment transport patterns in Lirquén Harbor, Chile, through grain-size trend analysis: a test of methods

.

Determination of net sediment transport patterns in Lirquén Harbor, Chile, through grain-size trend analysis: a test of methods

Mostrar registro completo

Estatísticas

Título Determination of net sediment transport patterns in Lirquén Harbor, Chile, through grain-size trend analysis: a test of methods
Autor Ríos, Felipe
Ulloa, Raúl
Correa, Iran Carlos Stalliviere
Abstract During June 1997, bottom sediment samples were collected at 76 stations on a rectangular grid in a small port (Lirquén Harbor, south-central Chile) facing siltation problems. The spatial changes in grain-size parameters, analyzed by using three different methodologies to infer net sediment transport paths, are compared with the measured water circulation of the study area and sediment dispersal patterns on aerial photographs. A Geographical Information System (GIS) is used to determine the degree of similarity between the results of the three grain-size trend methodologies. The results of this study confirm that because of its formulation and underlying assumptions, the McLaren-Bowles methodology tends to confuse the space-scale of sediment transport processes. In this way, the obtained transport patterns are in poor correlation with the observed hydrodynamics and aerial photographs and they seem to represent a combination of the spatial macroscale and mesoscale sediment transport processes existing in Concepcion Bay and in Lirquén Harbor, respectively. On the contrary, because the results yielded by the Gao-Collins and Le Roux methodologies correlate well with these studies, it is suggested that both methodologies be applied in combination to allow a better representation of local net sediment transport patterns, especially in estuarine environments where multiple sediment sources exist. Spatial analysis suggests that transport pathways obtained through these two methodologies represent the mesoscale sediment circulation existing in Lirquén Harbor. This study also emphasizes the importance of applying a statistical test to the transport trend vectors obtained using the GSTA program of Gao (1996), as these may erroneously reflect sediment transport direction. Lastly, the analyzed data and the results of the models are combined to determine the sediment transport regime existing in Lirquén Harbor.
Contido em Pesquisas em Geociências. Porto Alegre, RS. Vol. 30, n. 1 (2003), p. 65-81
Assunto Transporte de sedimentos
[en] GIS
[en] Grain-size trends
[en] Lirquén Harbor
[en] Sediment transport patterns
[en] Southern Chile
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/22596
Arquivos Descrição Formato
000390626.pdf (1.995Mb) Texto completo Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.